Update README.md with SSH

Author: lspgn

README.md

@@ -17,20 +17,23 @@ _This software comes with no warranty._
 * Prometheus metrics
 * Lightweight
 * TLS
+* SSH
 * Signature verification and expiration control
 
 ## Features of the extractor
 
 * Generate a list of prefixes sent via RTR (similar to Cloudflare JSON input, or RIPE RPKI Validator)
 * Lightweight
 * TLS
+* SSH
 
 ## Features of the API
 
 * Protocol v0 of [RFC6810](https://tools.ietf.org/html/rfc6810)
 * Protocol v1 of [RFC8210](https://tools.ietf.org/html/rfc8210)
 * Event-driven API
 * TLS
+* SSH
 
 ## To start developing